Improvement in mechanical movements



Patentedjene 3,1873.

B. DULITTLE. Meehanca'l Movements.`

-Q llllllllllllli w UNITED STATES PATENT OEEIGE. N

IAMES B. DOOLITTLE, OF WALLIN-GFORD, CONNECTICUT.

IMPROVEMENT IN MECHANICAL MOVEMENTS.

Specification forming part of Letters Patent No. 139,499, dated June 3, 1873 application filed April 3, 1873.

To all whom it may concern:

Be it known that I, JAMES B. DooLITTLE, of Wallingford, in the county ot' New Haven and State ot' Connecticut, have invented a new Improvement in Mechanical Movement; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters ot' reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure l, a side view; Fig. 2, a front view of the slide; Fig. 3, a vertical section of the same.

This invention relates to an improved method of converting rotary into reciprocating motion, adapted to various purposes, but here represented as applied to a power-press. The invention consists in combining with a crank-pin or eccentric a pair ot segments, each resting upon opposite sides ot' the said eccentric, and bearing, respectively, upon the opposite ends ot' a slot or stirrup, the length ot' the said stirrup being the diameter of the combined segments and crank-pin, so that as the crank-pin revolves the said segments rock to and fro in the said slot, imparting to the piece or thing within which the said slot is formed a reciprocating movement corresponding to the throw of t-he crank-pin or eccentric.

`As applied to a power-press, A represents the frame, B the slide working vertically in guides C. In connection with the slide B is a stirrup or frame, D, having a slot, E, formed therein. Within this` slot the crank-pin F,A extends from the shaft Gr. This may be a crankpin or other device to impart a rotary movement. Within the slot E, and upon the crankpin, I arrange a segment, H, above, and H below, the crank-pin fitting between the two, as seen in Fig. 2, and the extreme diameter between the two segments being equal to the lengthot the slot E; therefore, as the crankpin revolves, starting from the highest point, as seen in Fig. 2, and turning to the right to one-fourth around, as seen in Fig. 3, the segments, rocking upon their respective bearings in the frame, turn over to the right, and, passing down, will at theirlowest point. again assume a vertical position, and at the third quarter the extreme position to the left, then again to a vertical position at the last quarter or up position, eachrevolution causing the segments to rock back `and forth in the slot.

To retain the segments in their proper position corresponding teeth or notches, a, are formed on the bearing-surfaces between the segments and the frame, as seen in Fig. 3. Thus at each full revolution of the shaft a full reciprocating movement to the extent ot' the throw ot' the crank-pin is imparted. This method of converting motion is applicable to many purposes where such a conversion is desirable.

I claim as myinvention- In combination with the crank-pin or eccentric F and frame D, the two segments II` 

